【简答题】Coupons should be thrown away because__________.
【单选题】计算病情指数,首先对病害发生的严重程度进行 ( ) 。
【简答题】A.kept B.pulled C.thrown
【单选题】Why is the rubbish still here? It ought to yesterday.()
【单选题】Factories must clean their water ______.
A.
before it is thrown away
B.
when it is thrown away
C.
after it is thrown away
【判断题】在红外光谱中C-H,C-C,C-O,C-Cl,C-Br键的伸缩振动频率依次增加。()
【单选题】H 2 O在红外光谱中出现的吸收峰数目为( )。
【单选题】The sunlight is white and blinding, ____ hard-edged shadows on the ground. A. throwing B. being thrown C. to throw D. to be thrown
【单选题】We’ve never seen_____ exciting film before. [ ]
【单选题】Seven billion drink cans ____ in Britain each year.